#!/bin/bash

# SPDX-License-Identifier: GPL-2.0-or-later
# Copyright (C) 2009-2016 Stephan Raue (stephan@openelec.tv)
# Copyright (C) 2016-present Team LibreELEC (https://libreelec.tv)
# Copyright (C) 2023 JELOS (https://github.com/JustEnoughLinuxOS)
# Copyright (C) 2022-present UnofficialOS

################################################################################
# variables such as ${ROOT} ${PATH} etc... that are required for this
# script to work must be passed via env ... in scripts/image
################################################################################

# set variables
LE_TMP=$(mktemp -d -p ${TARGET_IMG})
SAVE_ERROR="${LE_TMP}/save_error"
. projects/${PROJECT}/devices/${DEVICE}/options

if [ -z "${SYSTEM_SIZE}" -o -z "${SYSTEM_PART_START}" ]; then
  echo "mkimage: SYSTEM_SIZE and SYSTEM_PART_START must be configured!"
  exit 1
fi

if [ "${PARTITION_TABLE}" = "gpt" ]; then
  DISK_GPT_PADDING=1
else
  DISK_GPT_PADDING=0
fi

DISK_START_PADDING=$(( (${SYSTEM_PART_START} + 2048 - 1) / 2048 ))
DISK_SIZE=$(( ${DISK_START_PADDING} + ${SYSTEM_SIZE} + ${STORAGE_SIZE} + ${DISK_GPT_PADDING} ))
DISK_BASENAME="${TARGET_IMG}/${IMAGE_NAME}"
if [ -n "${SUBDEVICE}" ]; then
  DISK_BASENAME="${DISK_BASENAME}-${SUBDEVICE}"
fi
DISK="${DISK_BASENAME}.img"

# functions
cleanup() {
  echo -e "image: cleanup...\n"
  rm -rf "${LE_TMP}"
}

show_error() {
  echo "image: An error has occurred..."
  echo
  if [ -s "${SAVE_ERROR}" ]; then
    cat "${SAVE_ERROR}"
  else
    echo "Folder ${LE_TMP} might be out of free space..."
  fi
  echo
  cleanup
  exit 1
}

trap cleanup SIGINT

# create an image
echo -e "\nimage: creating sparse file for disk image ${DISK##*/}..."
dd if=/dev/zero of="${DISK}" bs=1M count=0 seek="${DISK_SIZE}" conv=fsync >"${SAVE_ERROR}" 2>&1 || show_error

# write a disklabel
echo "image: creating ${PARTITION_TABLE} partition table..."
parted -s "${DISK}" mklabel ${PARTITION_TABLE}
sync

# create partitions
echo "image: creating partitions..."

if [ "${PARTITION_TABLE}" = "gpt" ] && [ "${BOOTLOADER}" = "u-boot" ]
then
  echo "image: creating SPL partition(s)."
  parted -s "${DISK}" unit s mkpart ${UBOOT_LABEL} 16384 24575 >/dev/null 2>&1
  parted -s "${DISK}" unit s mkpart ${TRUST_LABEL} 24576 32767 >/dev/null 2>&1
fi

SYSTEM_PART_END=$(( ${SYSTEM_PART_START} + (${SYSTEM_SIZE} * 1024 * 1024 / 512) - 1 ))
STORAGE_PART_START=$(( ${SYSTEM_PART_END} + 1 ))
STORAGE_PART_END=$(( ${STORAGE_PART_START} + (${STORAGE_SIZE} * 1024 * 1024 / 512) - 1 ))

if [ "${PARTITION_TABLE}" = "gpt" ]; then
  echo "image: Create GPT boot partition."
  parted -s "${DISK}" -a min unit s mkpart boot fat32 ${SYSTEM_PART_START} ${SYSTEM_PART_END}
else
  echo "image: Create MBR boot partition."
  parted -s "${DISK}" -a min unit s mkpart primary fat32 ${SYSTEM_PART_START} ${SYSTEM_PART_END}
  parted -s "${DISK}" set 1 boot on
fi

if [ "${PARTITION_TABLE}" = "gpt" ]; then
    echo "image: Create GPT storage partition."
    parted -s "${DISK}" -a min unit s mkpart storage ext4 ${STORAGE_PART_START} ${STORAGE_PART_END}
  else
    echo "image: Create MBR Storage partition."
    parted -s "${DISK}" -a min unit s mkpart primary ext4 ${STORAGE_PART_START} ${STORAGE_PART_END}
fi
sync

if [ "${PARTITION_TABLE}" = "gpt" ] && [ "${BOOTLOADER}" = "u-boot" ]; then
  echo "image: Set OS partition as boot"
  parted -s "${DISK}" set 3 boot on
fi
sync

echo "image: creating sparse file for part2..."
STORAGE_PART_COUNT=$(( ${STORAGE_PART_END} - ${STORAGE_PART_START} + 1 ))
sync
dd if="${DISK}" of="${LE_TMP}/part2.ext4" bs=512 count=0 seek="${STORAGE_PART_COUNT}" conv=fsync >"${SAVE_ERROR}" 2>&1 || show_error

# create filesystem on part2
echo "image: creating filesystem on part2..."
mke2fs -F -q -t ext4 -m 0 -O ^orphan_file "${LE_TMP}/part2.ext4"
tune2fs -L "${DISTRO_DISKLABEL}" -U ${UUID_STORAGE} "${LE_TMP}/part2.ext4" >"${SAVE_ERROR}" 2>&1 || show_error
e2fsck -n "${LE_TMP}/part2.ext4" >"${SAVE_ERROR}" 2>&1 || show_error
sync

# add resize mark
mkdir "${LE_TMP}/part2.fs"
touch "${LE_TMP}/part2.fs/.please_resize_me"
echo "image: populating filesystem on part2..."
populatefs -U -d "${LE_TMP}/part2.fs" "${LE_TMP}/part2.ext4" >"${SAVE_ERROR}" 2>&1 || show_error
sync
e2fsck -n "${LE_TMP}/part2.ext4" >"${SAVE_ERROR}" 2>&1 || show_error

# merge part2 into disk image
echo "image: merging part2 into disk image..."
dd if="${LE_TMP}/part2.ext4" of="${DISK}" bs=512 seek="${STORAGE_PART_START}" conv=fsync,notrunc >"${SAVE_ERROR}" 2>&1 || show_error

# create part1 to format and copy files
echo "image: creating sparse file for part1..."
SYSTEM_PART_COUNT=$(( ${SYSTEM_PART_END} - ${SYSTEM_PART_START} + 1 ))
sync
dd if=/dev/zero of="${LE_TMP}/part1.fat" bs=512 count=0 seek="${SYSTEM_PART_COUNT}" conv=fsync >"${SAVE_ERROR}" 2>&1 || show_error

shopt -s expand_aliases  # enables alias expansion in script
alias mcopy='mcopy -i "${LE_TMP}/part1.fat" -o'
alias mmd='mmd -i "${LE_TMP}/part1.fat"'

# create filesystem on part1
echo "image: creating filesystem on part1..."

if [ "${BOOTLOADER}" = "syslinux" -o "${BOOTLOADER}" = "u-boot" ]; then
  mformat -i "${LE_TMP}/part1.fat" -v "${DISTRO_BOOTLABEL}" -N "${UUID_SYSTEM//-/}" :: >"${SAVE_ERROR}" 2>&1 || show_error
fi
sync

if [ "${BOOTLOADER}" = "syslinux" ]; then
  # create bootloader configuration
  echo "image: creating bootloader configuration..."
  cat << EOF > "${LE_TMP}/syslinux.cfg"
DEFAULT run
TIMEOUT 0
PROMPT 0
NOESCAPE 1

LABEL run
  KERNEL /${KERNEL_NAME}
  APPEND boot=UUID=${UUID_SYSTEM} disk=UUID=${UUID_STORAGE} portable ${EXTRA_CMDLINE}
EOF

  cat << EOF > "${LE_TMP}/grub.cfg"
set timeout="0"
set default="Run"
menuentry "Run" {
	search --set -f /KERNEL
	linux /KERNEL boot=UUID=${UUID_SYSTEM} disk=UUID=${UUID_STORAGE} grub_portable ${EXTRA_CMDLINE}
}
EOF

  mcopy "${LE_TMP}/syslinux.cfg" ::

  # install syslinux
  echo "image: installing syslinux to part1..."
  syslinux.mtools -i "${LE_TMP}/part1.fat" >"${SAVE_ERROR}" 2>&1 || show_error

  # copy files
  echo "image: copying files to part1..."
  mcopy "${TARGET_IMG}/${BUILD_NAME}.kernel" "::/${KERNEL_NAME}"
  mcopy "${TARGET_IMG}/${BUILD_NAME}.system" ::/SYSTEM
  mcopy "${RELEASE_DIR}/target/KERNEL.md5" "::/${KERNEL_NAME}.md5"
  mcopy "${RELEASE_DIR}/target/SYSTEM.md5" ::/SYSTEM.md5

  mmd EFI EFI/BOOT
  mcopy "${TOOLCHAIN}/share/syslinux/bootx64.efi" ::/EFI/BOOT
  mcopy "${TOOLCHAIN}/share/syslinux/ldlinux.e64" ::/EFI/BOOT
  mcopy "${TOOLCHAIN}/share/grub/bootia32.efi" ::/EFI/BOOT
  mcopy "${LE_TMP}/grub.cfg" ::/EFI/BOOT

elif [ "${BOOTLOADER}" = "u-boot" -a \( -n "${UBOOT_CONFIG}" -o -n "${SUBDEVICE}" \) ]; then
  # create bootloader configuration
  echo "image: creating bootloader configuration... (u-boot)"

  for DTB in ${DEVICE_DTB[@]}
  do
    if [ -f "${RELEASE_DIR}/3rdparty/bootloader/${DTB}.dtb" ]; then
      mcopy "${RELEASE_DIR}/3rdparty/bootloader/${DTB}.dtb" ::
    fi
  done

  if [ -f "${PROJECT_DIR}/${PROJECT}/devices/${DEVICE}/bootloader/mkimage" ]; then
    . "${PROJECT_DIR}/${PROJECT}/devices/${DEVICE}/bootloader/mkimage"
  elif [ -f "${PROJECT_DIR}/${PROJECT}/bootloader/mkimage" ]; then
    . "${PROJECT_DIR}/${PROJECT}/bootloader/mkimage"
  else
    echo "image: skipping u-boot. no mkimage script found"
  fi

  echo "image: copying files to part1..."
  mcopy "${TARGET_IMG}/${BUILD_NAME}.kernel" "::/${KERNEL_NAME}"
  mcopy "${TARGET_IMG}/${BUILD_NAME}.system" ::/SYSTEM
  mcopy "${RELEASE_DIR}/target/KERNEL.md5" "::/${KERNEL_NAME}.md5"
  mcopy "${RELEASE_DIR}/target/SYSTEM.md5" ::/SYSTEM.md5

elif [ "${BOOTLOADER}" = "u-boot" ]; then
  echo "to make an image using u-boot UBOOT_SYSTEM must be set"
  cleanup
  exit
fi # bootloader

# run fsck
echo "image: checking filesystem on part1..."
sync
fsck.fat -n "${LE_TMP}/part1.fat" >"${SAVE_ERROR}" 2>&1 || show_error

# merge part1 into disk image
echo "image: merging part1 into disk image..."
dd if="${LE_TMP}/part1.fat" of="${DISK}" bs=512 seek="${SYSTEM_PART_START}" conv=fsync,notrunc >"${SAVE_ERROR}" 2>&1 || show_error

# gzip
echo "image: compressing..."
pigz --best --force "${DISK}"

# create sha256 checksum of image
(
  cd "${TARGET_IMG}"
  sha256sum "${DISK##*/}.gz" > "${DISK##*/}.gz.sha256"
)

if [ -n "${LOCAL_SSH_KEYS_FILE}" ] || \
   [ -n "${LOCAL_WIFI_SSID}" ] || \
   [ -n "${LOCAL_WIFI_KEY}" ]
then
  echo "image: CONTAINS SENSITIVE DATA, DO NOT DISTRIBUTE."
fi

# cleanup
cleanup
exit
